US Bridges

Kalmia Avenue over Elmers Two Mile Ditch

Fair

Boulder County, Colorado · 0.1 MI W of Folsom Street · Structure no. BOLD-10-0.10-01

Built
1973
52 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
551
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Kalmia Avenue over Elmers Two Mile Ditch is a concrete culvert carrying Kalmia Avenue over Elmers Two Mile Ditch in Boulder County, Colorado. It was built in 1973, so it is 52 years old, older than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 551 vehicles a day, roughly 5% of them trucks, projected to reach 661 by 2043. The structure is 21 ft (6.4 m) long and 69 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

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CarriesKalmia Avenue
CrossesElmers Two Mile Ditch
Location0.1 MI W of Folsom Street
RouteCity Street 0
CountyBoulder County
StateColorado
Coordinates40.03926, -105.26511
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width69 ft (20.9 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic551 (2023)
Projected traffic661 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed100 mi (161 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Kalmia Avenue over Elmers Two Mile Ditch built?

It was built in 1973, making it 52 years old in 2025.

What condition is Kalmia Avenue over Elmers Two Mile Ditch in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2025.

How much traffic does Kalmia Avenue over Elmers Two Mile Ditch carry?

About 551 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Kalmia Avenue over Elmers Two Mile Ditch?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 69 ft wide.

Who owns Kalmia Avenue over Elmers Two Mile Ditch?

It is owned by the City or Municipal Highway Agency.